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Four green DDR4 RDIMM modules with gold contacts and black chips, no heat spreaders

OWC

OWC 128GB (4x32GB) DDR4 2400 CL17 ECC Registered RDIMM Cisco UCS C240 M4 memory upgrade

SKU CH-EMTY-M8D8G

128GB kit of four 32GB DDR4 2400MHz CL17 ECC registered RDIMMs for Cisco UCS C240 M4 servers

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (4 x 32GB)

  • ECC registered design protects data integrity in servers
  • 128GB total capacity across four 32GB modules
  • DDR4 2400 speed with CL17 latency for responsive performance
  • 2V operation reduces power draw in dense configurations
  • Direct replacement for Cisco part numbers HXMR1X322RVA and UCSMR1X322RVA

Cisco UCS C240 M4 memory kit

This 128GB kit contains four 32GB DDR4 registered DIMMs built for the Cisco UCS C240 M4 server. It is intended for administrators who need to expand memory capacity in that specific platform. The modules will not work in standard desktop computers or consumer motherboards. They also cannot be mixed with unbuffered or load-reduced ECC memory.

Registered ECC DDR4 at 2400 MT/s

The decisive specification is the registered ECC design combined with a 2400 MT/s data rate and CL17 latency. This exact combination matches the Cisco UCS C240 M4 memory controller requirements. Using unregistered or non-ECC modules would prevent the system from posting.

Low-voltage operation without heat spreaders

Each module runs at 1.2 V and has no heat spreader, relying on the server’s directed airflow for cooling. Power draw stays low under typical workloads, and the bare PCB design keeps acoustic impact negligible inside the chassis.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $903.99
Pricier than about 60% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.06 per GB
Cheaper than about 57% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R4D42R4128S
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco UCS C240 M4

Other versions of this model

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Questions about this item

What real-world throughput does the DDR4 2400 CL17 kit deliver in a Cisco UCS C240 M4?

The modules run at 2400 MT/s with CL17 timing, providing the bandwidth the server platform expects from PC4-19200 registered ECC memory.

How does the 288-pin registered ECC interface limit mixing with other memory types?

Registered ECC RDIMMs cannot be mixed with unbuffered or load-reduced DIMMs; all slots must use the same registered ECC type for the system to operate.

What physical clearance do the 32 GB modules need inside the Cisco UCS C240 M4?

Each 288-pin RDIMM fits the standard DIMM slots in the C240 M4; the kit contains four 32 GB modules with no heat spreader, so they occupy the normal slot height.

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